[aprssig] PSAT digipeater is ON (ARISS and APRSAT aliases)

Robert Bruninga bruninga at usna.edu
Tue Jun 2 21:50:40 CDT 2015


PSAT uses the TinyTrack4 digipeater hardware and it does NOT do callsign
substitution like all the other space digipeaters do.



The TinyTrack4 (PSAT) only does call –insertion-.  Thus the uplinked VIA
ARISS comes down as PSAT,ARISS* (call insertion).  Where the same packet
sent via the ISS using the path VIA ARISS comes down as RS0ISS* where the
“RS0ISS” is –substituted- for the original ARISS.



Sorry this is confusing, but ARISS and APRSAT were always the intended
generic Satellite Aliases, just like WIDEn-N is on Earth.  The reason that
there are both ARISS and APRSAT is because the original radio/TNC on the
ISS only could supplrt a single ALIAS.  And since it was using ARISS, then
the only way to make all APRS satellites generic was then to put ARISS in
ALL APRS satellites too.  It has been this way since 2001 in all APRS
satellites.



These satellites all responded to the ARISS generic alias:  PCSAT-1,
PCSAT-11, PCSAT-2, PCSAT-12, ANDE-1, ANDE-2, RAFT, and now PSAT.



The problem is that PSAT (with TT4 hardware) does not do call substitution
but instead does call INSERTION.  That is why you see ARISS* in the
downlink and why many filters are not seeing them.



Bob, Wb4APR



*From:* aprssig [mailto:aprssig-bounces at tapr.org] *On Behalf Of *Lynn W.
Deffenbaugh (Mr) via aprssig
*Sent:* Tuesday, June 02, 2015 9:43 PM
*To:* TAPR APRS Mailing List
*Subject:* Re: [aprssig] PSAT digipeater is ON



The filter governs what the APRS-IS network will send to you via the
Internet.  Every packet that is received on an RF port is gated to the
APRS-IS if you've kept the default settings in APRSISCE/32, provided of
course that you have a valid passcode for your callsign.

Only Bob can answer what PSAT inserts into a digipeated packet, but yes, I
believe it responds to ARISS as a digipeat-able alias.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

On 6/2/2015 9:31 PM, pfbram at comcast.net wrote:

Thanks -- I see I needed to TX a beacon first, since my position (albeit
fixed) had staled. But judging from the AOS time, I'll be leaving my APRSIS
igate up all night. May as well leave it up the remainder of the week. I
have a filter setup as per your instructions here:
http://aprsisce.wikidot.com/doc:satelliteops

Set Configure / General / Add Filter to b/RS0ISS*/W3ADO-1/ARISS
d/RS0ISS*/W3ADO-1/ARISS

Since Bob mentioned that ARISS is one of the aliases, is this filter good
as-is? i.e. It won't ignore PSAT?

Thanks,
73, KD0KZE / Paul
------------------------------

*From: *"Lynn W. Deffenbaugh (Mr) via aprssig" <aprssig at tapr.org>
<aprssig at tapr.org>
*To: *"TAPR APRS Mailing List" <aprssig at tapr.org> <aprssig at tapr.org>
*Sent: *Tuesday, June 2, 2015 3:11:55 PM
*Subject: *Re: [aprssig] PSAT digipeater is ON

Send an APRS message to SAT99993 with any body content.  This is a pass
predictor based on Bob's published TLE from a while ago.  It is probably
off by up to an hour now, but it'd be better than nothing.  I'll keep it
current with each TLE that comes from Bob.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

PS.  See also: http://aprsisce.wikidot.com/doc:satsrv

On 6/2/2015 3:39 PM, Paul Bramscher via aprssig wrote:

I use GPredict, which leans on celestrak for TLE's.  I don't think I
can/should manually enter TLE's into that program.  They might get wiped
out with the next network TLE refresh -- or go stale otherwise.  If the
PSAT TLE's aren't yet part of the celestrak feed, is there a web site out
there (e.g. ariss.net, aprs.fi, etc.) providing PSAT tracking?  Would also
be nice to see some web-based tracking integration with openstreetmap.org
-- it's becoming quite polished lately.  If time permitted, I'd tinker with
that myself.



My igates don't yet run 24x7, but I'd like to see whether my setups can
hear it for passes when I'm able to tinker in the shack.



73, KD0KZE / Paul


------------------------------

*From: *"Nagi Punyamurthula via aprssig" <aprssig at tapr.org>
<aprssig at tapr.org>
*To: *"Stephen H. Smith" <wa8lmf2 at aol.com> <wa8lmf2 at aol.com>, "TAPR APRS
Mailing List" <aprssig at tapr.org> <aprssig at tapr.org>, "Robert Bruninga"
<bruninga at usna.edu> <bruninga at usna.edu>
*Sent: *Tuesday, June 2, 2015 12:53:06 PM
*Subject: *Re: [aprssig] PSAT digipeater is ON



I'm trying to track the orbit for PSAT using celestrak TLE however, can't
seem to find him there.  Can someone share where one can find the TLE for
PSAT
www.celestrak.com/NORAD/elements/amateur.txt



this is a fantastic milestone in the APRS technology wave; Congrats to Bob,
et al involved in landing this project.



Thanks



73, N0AGI, Nagi
http://N0AGI.com/
http://aprs.fi/info/N0AGI




-----Original Message-----
From: aprssig [mailto:aprssig-bounces at tapr.org <aprssig-bounces at tapr.org>]
On Behalf Of Stephen H. Smith via aprssig
Sent: Tuesday, June 02, 2015 12:06 PM
To: Robert Bruninga; TAPR APRS Mailing List
Subject: Re: [aprssig] PSAT digipeater is ON



On 6/2/2015 9:38 AM, Robert Bruninga via aprssig wrote:
> APRS activists:
>



> I don’t expect anyone to wear out their rotators tracking PSAT, no,
> just a simple vertical over a ground plane will do.  Either a 19”
> vertical whip over a large 6 foot square ground plane or even better,
> a 58” vertical monopole over the ground plane.  This ¾ wavelength
> vertical has almost 7 dBi gain and will pick up signals during the few
minutes overhead.




I currently have an Icom AH-7000 discone monitoring 145.825 for the ISS
digipeter running 24/7.



Go to <http://WA8LMF.net/map> <http://WA8LMF.net/map> and follow the links
there.



It appears to be not very effective for high-elevation RX.   I assume the
discone has more of a vertical dipole-like pattern that favors the horizon
rather than over head, perhaps with slightly fatter lobes than a normal
vertical dipole.  As I often say, it's equally poor at all frequencies from
50-1000 MHz.....



I assume the 3/4-wave vertical, over an adequate ground plane, would have
multiple lobes with one up-tilted substantially, and would favor high-angle
RX better than the discone.  Albeit with still a null at at or near the
zenith.



Any sense how the 3/4-wave compares with the discone?



I am considering building a Lindenblad antenna (four 1/2-wave dipoles
arranged in a horizontal square with each one tilted about 30 degrees from
horizontal) that supposedly creates a nearly hemispherical pattern that is
circularly polarized at the zenith. Apparently the FAA uses these to
communicate with aircraft anywhere from the horizon to directly overhead.



Anyone have experience with the Lindenblad for satellite downlinks on 2M?
How
does it compare with the other two above?



___________________________________



Stephen H. Smith    wa8lmf (at) aol.com
Skype:        WA8LMF
EchoLink:  Node #  14400  [Think bottom of the 2-meter band]
Home Page:          http://wa8lmf.net



Live Off-The-Air APRS Activity Maps
    <http://wa8lmf.net/map> <http://wa8lmf.net/map>



Long-Range APRS on 30 Meters HF
    <http://wa8lmf.net/aprs/HF_APRS_Notes.htm>
<http://wa8lmf.net/aprs/HF_APRS_Notes.htm>




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